| Name | Oakes |
| Gender | Boy |
| Name | Oakley |
| Gender | Boy |
| Name | Obadiah |
| Gender | Boy |
| Name | Oberon |
| Gender | Boy |
| Name | Obie |
| Gender | Boy |
| Name | Obrigato |
| Gender | Boy |
| Name | Ocie |
| Gender | Boy |
| Name | Octabiano |
| Gender | Boy |
| Name | Octavian |
| Gender | Boy |
| Name | Octavio |
| Gender | Boy |
| Name | Octavius |
| Gender | Boy |
| Name | Odell |
| Gender | Boy |
| Name | Odie |
| Gender | Boy |
| Name | Odin |
| Gender | Boy |
| Name | Odis |
| Gender | Boy |
| Name | Odysseus |
| Gender | Boy |
| Name | Ogden |
| Gender | Boy |
| Name | Ogilvie |
| Gender | Boy |
| Name | Okey |
| Gender | Boy |
| Name | Olaf |
| Gender | Boy |
| Name | Olan |
| Gender | Boy |
| Name | Ole |
| Gender | Boy |
| Name | Olen |
| Gender | Boy |
| Name | Olin |
| Gender | Boy |
| Name | Oliver |
| Gender | Boy |
| Name | Ollie |
| Gender | Boy |
| Name | Olukayode |
| Gender | Boy |
| Name | Omar |
| Gender | Boy |
| Name | Omarah |
| Gender | Boy |
| Name | Omari |
| Gender | Boy |
| Name | Omarion |
| Gender | Boy |
| Name | Omaritzy |
| Gender | Boy |
| Name | Omer |
| Gender | Boy |
| Name | Omylan |
| Gender | Boy |
| Name | Oneal |
| Gender | Boy |
| Name | Ora |
| Gender | Boy |
| Name | Oral |
| Gender | Boy |
| Name | Oran |
| Gender | Boy |
| Name | Ordean |
| Gender | Boy |
| Name | Oren |
| Gender | Boy |
| Name | Orie |
| Gender | Boy |
| Name | Orin |
| Gender | Boy |
| Name | Orion |
| Gender | Boy |
| Name | Orlan |
| Gender | Boy |
| Name | Orland |
| Gender | Boy |
| Name | Orlando |
| Gender | Boy |
| Name | Orlo |
| Gender | Boy |
| Name | Orman |
| Gender | Boy |
| Name | Ormond |
| Gender | Boy |
| Name | Orrin |
| Gender | Boy |
| Name | Orson |
| Gender | Boy |
| Name | Orton |
| Gender | Boy |
| Name | Orval |
| Gender | Boy |
| Name | Orvil |
| Gender | Boy |
| Name | Orville |
| Gender | Boy |
| Name | Orvin |
| Gender | Boy |
| Name | Osborn |
| Gender | Boy |
| Name | Osborne |
| Gender | Boy |
| Name | Oscar |
| Gender | Boy |
| Name | Osgood |
| Gender | Boy |
| Name | Osiris |
| Gender | Boy |
| Name | Osmond |
| Gender | Boy |
| Name | Ossian |
| Gender | Boy |
| Name | Osvaldo |
| Gender | Boy |
| Name | Oswald |
| Gender | Boy |
| Name | Otha |
| Gender | Boy |
| Name | Otho |
| Gender | Boy |
| Name | Otis |
| Gender | Boy |
| Name | Ottis |
| Gender | Boy |
| Name | Otto |
| Gender | Boy |
| Name | Ovid |
| Gender | Boy |
| Name | Owen |
| Gender | Boy |
| Name | Owynn |
| Gender | Boy |
| Name | Oxford |
| Gender | Boy |
| Name | Oz |
| Gender | Boy |
